1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 The Regional Haze Rule of the U.S. Environmental Protection Agency mandates reduction in U.S. anthropogenic emissions to achieve linear improvement of visibility in wilderness areas over the 2004-2018 period toward an endpoint of natural visibility conditions by 2064. Linear improvement is to apply to the mean visibil...

Let T be a set of n triangles in three-dimensional space, let s be a line segment, and let t be a triangle, both disjoint from T . We consider the visibility map of s with respect to T , i.e., the portions of T that are visible from s. The visibility map of t is defined analogously. We look at two different notions of visibility: strong (complete) visibility, and weak (partial) visibility. The ...

In the Any-Angle Pathfinding problem, the goal is to find the shortest path between a pair of vertices on a uniform square grid, that is not constrained to any fixed number of possible directions over the grid. Visibility Graphs are a known optimal algorithm for solving the problem with the use of preprocessing. However, Visibility Graphs are known to perform poorly in terms of running time, es...

On the basis, of the condition for demouldability, two levels of visibility, complete and partial visibility, are defined. The viewing directions from which a surface is completely visible can be represented as a convex region on the unit sphere called the visibility map of the surface. Algorithms are given for dividing a given object into pockets, for which visibility and demouldability can be...

horizon map Representing the Visibility Structure of a Polyhedral Terrain through a Horizon Map We present a model for describing the visibility of a polyhedral terrain from a xed viewpoint, based on a collection of nested horizons. We brie y introduce the concepts of mathematical and digital terrain models, and some background notions for visibility problems on terrains. Then, we de ne horizon...

This study is concerned with the safety risk of reduction of visibility on roadways. One way to improve safety under reduced visibility conditions (i.e., reduce the risk of visibility related crashes) is to improve drivers' behavior under such adverse weather conditions. However, there is lack of studies that attempted to better understand drivers' behavior at different traffic and visibility c...

This paper describes the application of a Doppler Light Detection And Ranging (LIDAR) system to the monitoring of visibility at the Hong Kong International Airport (HKIA). The backscattered power data from the LIDAR are inverted by Klett’s method (1981) into extinction coefficient and then into atmospheric visibility. A plan position indicator (PPI) scan of the LIDAR thus enables the production...

This study is concerned with the safety risk of reduction of visibility on roadways. One way to improve safety under reduced visibility conditions (i.e., reduce the risk of visibility related crashes) is to improve drivers' behavior under such adverse weather conditions. However, there is lack of studies that attempted to better understand drivers' behavior at different traffic and visibility c...

Cycle simulators, in-circuit emulators, and hardware accelerators have made it possible to rapidly model the functionality of large digital designs. But these techniques provide limited visibility of internal design nodes, making debugging hard. Simulators run slowly when all nodes are traced. Emulators provide full visibility only with limited depth, or with greatly reduced speed. This paper d...